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What's the difference between Viral Marketing and something new called the Viral Expansion Loop?

"It's a type of engineering alchemy that, done right, almost guarantees a self-replicating, borglike growth: One user becomes two, then four, eight, to a million and beyond. It's not unlike taking a penny and doubling it daily for 30 days. By the end of a week, you'd have 64 cents; within two weeks, $81.92; by day 30, about $5.4 million.

Why is the power of the Viral Expansion Loop infinitely more engaging than a typical Viral Marketing campaign? It's the human element. For me to pass along a video because I find it engaging, and know it will make me look good in someone else's eyes, is one thing. For me to be a part of something that I am deeply interested in, and know that it will have zero value unless I invite other like-minded individuals to part, is infinitely more powerful.

How powerful?

"Once this phantasmagorical growth kicks in, you can actually predict its rate with astonishing accuracy -- something Ning has been doing since the beginning. (Viral loops expand according to what's known as a Power Law Curve, which, for reasons no one can explain seem to accurately describe a dizzying array of natural and unnatural phenomena, from the size of planets to national income distribution to online commerce.) But another implication of viral expansion is that once a company attracts a certain number of users, it becomes all but unstoppable. After PayPal blossomed as an online transaction power, eBay launched a competing service -- and failed miserably (and eventually bought PayPal instead). To combat YouTube, Google and Yahoo launched rival sites, neither of which went anywhere. LinkedIn and Twitter have likewise become unassailable by aggregating huge pools of users. In only one instance, Friendster, has a company fallen apart after achieving this kind of reach, and it was largely done in by technical failures -- network meltdowns and outages -- that drove users into the embrace of MySpace and Facebook."

Never before has it been more important to be thinking about a corporate strategy surrounding online communities. A good place to start would be reading this article: Fast Company - Ning's Infinite Ambition.